In one of the largest drug busts in U.S. history, federal authorities in Philadelphia seized nearly 20 tons of cocaine—worth about $1 billion— last month from a ship owned by JP Morgan‘s asset management arm.

19.76 tons of cocaine (that’s an estimated street value of $1.3 billion, according to Business Insider) were seized from the ship when it arrived at Packer Marine Terminal in Philadelphia on June 17.

The ship, named MSCGayane, is operated by Switzerland-based Mediterranean Shipping Company, but it was financed by a transportation strategy fund run by JP Morgan‘s asset management arm. The ship is leased out to MSC.

Six crew members aboard MSC Gayane have been arrested and charged with knowingly and intentionally conspiring to possess more than five kilograms of cocaine, the Justice Department said in a statement.

The ship was flying under the flag of Liberia, a country in West Africa, according to online vessel tracking website MarineTraffic.

This isn’t the first time MSC has experienced problems with drug trafficking aboard its ships. Earlier this year, authorities in Philadelphia found 13 large black duffel bags with a combined 450 bricks of cocaine being shipped in one of MSC’s shipping containers.